<li class="sidebar-search">
    <div class="input-group custom-search-form">
        <input type="text" class="form-control" ng-model="searchApp" placeholder="Search...">
        <span class="input-group-btn">
      <button class="btn btn-default" type="button">
        <i class="fa fa-search"></i>
      </button>
    </span>
    </div>
</li>